Mechanical stoker



Dec- 22. 1925- E. A. WECK MECHANICAL STOKER kFilacl. Sept. 13. 1922 much.

Patented Dec. 2.2, 1925.

UNITED STATES 1,566,456 PATENT OFFICE.

ERWIN ALEXANDER WEOK, F DOLAU, BEUR, GERMANY. nommen sroxnn.

Application Med September 18, 1982. Serial' No. 588,016.

. tus with swinging shovel and with a wedgeshaped nose the shovel for spreading out the coal in fan-shape over the grate when the same is being thrown upon the grate with varying strength, possesses the inconvenience that the coa is generally not s read out wide enough at the front end of t e grate while at the rear end ofthe grate the spreadin ont is broad enough or even too broad. nsequently the coal accumulates at the frontend of the grate at the middle but not at the sides. This inconvenience is avoided by the invention;

According to the invention the two-armed curved cam which is ivotall mounted upon the driving wh for t e shovel and whose position is periodically altered -for altering the length of throw with the aid of convenient means, eo-operates with a fixed roller in Such a manner that the rear end of the lever is lifted by the roller shortl before it releases the tappet of the shove Consequently the shove at the short throw, is sli htly ulled bac from the coal which has pp in front of it, so that it strikes into the coal from a certain distance. The reboundi has the e ect that,l at the short throw., the coal is spread out in lateral direction.`

As at long throws the above mentioned roller does not actupon the' cam the shovel is in direct contact withthe coal so that the reboundi eilect does not take place and the coal is consequently not spread very The object of the invention is shown by way of example on the accompanying drawin wherein:

Fig. lis a vertical section through the .throwing box of a grate chargingappara-y tus, the section plane lbeing situated 1n the longitudinal 'ax-is of the grate.

Fig. .2 showsa part of the throwing box in front elevation the driving mechanism being shown in cross ysection.` Y l xFig. 8 is a section onv the line 3--3 of Figi' 2, the driving disk which su pivoted lever being omitted. T e cam is Vof this disk stroke which is thus produced.`

ports the l.

adjusted for wide throw. The tappet is at the middle position with regard to the cam.

Fig. 4 is a view similar to Fi being shown in the position s the release of the tappet. A

Fig. 5 is a view similar to Fig. 3 the pivoted cam bein adjusted for short t row and the tappet eing at the middle position with regard to the pivoted cam.

. 8, the parts ortly before Fig. 6 is a similar view to Fig. 5, the

tappet being shown 'in the lposition just before its release. e

The tappet b rigidly fixed upon the axle c serves for operating the shovel d which is adapted to swing around the axle o, and the outer edge of which moves in contact with the curved supporting plate p. This tappet b is lifted, against the action of a spring lc b the cam a. As soon as the tappet b is re cased by cam a the spring makes the tappet b and with it the shovel d swing back so that the shovel d throws upon the gate the coal which has dropped in front o it. i 'y The cam a is pivotally mounted u on the driving disk c' by means of bolt e. 'IEe driving disk z' has teeth at its circumference by means of which it is revolveduniformly.

Upon the shaft Z of the drivi disk i or upon the hub of said disk is revolubly mounted. Thercams g are adjustable in radial slots so that the shaft l can be adjusted. .As will be seen from Figure 2 the cams have Shanks ex tending through the radial slots and nuts are rovided on the protruding ends of the shan thus'allowng the cams' to be position ally adjusted j of the shovel d" another cam g ts under the end of the cai'n ae (theleft e'n u nthe drawing) so that thelength of row is altered.

The ais lament of the cams g with rerd to e cam a i'seiected by means of e' followA '0n the di mechanism: l acam m 1s arranged which 4at each revolution of disk, after each stroke of the shovel d pushes to the right a roller q which is mounted on'the sleeves adapted to 4be displaced on axle a the action of spring r. The sleeve n carries a. bolt o enging with an annular groove of disk f.

e disk f participates therefore in the displacement of the roller g and the hush n.

driving 'isk a cam in the slots. After each throw From the displacement of disk f results that the bolts t fixed on disk 1" disengage from notches of the disk fso that this disk no longer partici ates in the rotation ofdisk s. Any accidente rotation of disk f is prevented by a locking tooth u fixedv on the machine frame coming in gear with teeth v whenthe disk is in the extreme right hand osition, said teeth 'v being arranged on t e right hand face of disk f.

After disk 'i has executed one eighth of a revolution without drawing along disk f so that another cam g has come un cr the ieftend of the lever a, the cani m leaves the roller g so that the bush n, and with it the disk f, is again shifted to thc lefty by the action of spring r and the bolts t come again inen agement with the notches o f disk f. This giisk Iparticipates thus again 1n thc rotation o i the shovel has been raised by the cam a and released, thus executing a stroke. The same procedure Y is repeated again. This ar- 'angenient isshown and described in German patent 333,022 of 1921. The farther the cani which is going to act upon the lever is away from the center of the disk f the greater will be the stroke 'of the tapspet b and consequently the oscillation of the ovel d. Figs. v3 and 4 show a cam,'.wh1cli 1s comparatively far'distant from the center of `the cam disk, actingu on the cam a, the

tapiet being'shown in ig. 4 in the position rea y for release. The correspondi vposi-A tion of the shov'eld is indicated in to 6 in dash lines,

After the shovel d has been slowly lifted and its ring put under tension bythe front englp of lever a the coal drops v1n the direction of the arrow in front of the shovel. The cam being in the position shown in Figs. 3 and 4 the tension of the spring of theshovel d is not increased any more but rather slightl decreased after the coal has dropped so t at at the stroke of the shovel w ich is produced by' the action of the spring as soon asit is released by the cam a, the coal lies directly in front of the shovel and is con uently thrown far but but notmuch spre out.

A roller arranged upon the casing m is so adjusted that, if the cam a is adjusted for large throw, that is if the rear end of the cam a extends com aratively far towards the outer-side, the ront end of the cam a being consequently7 pressed inward, the roller h does not come in contact with the cam a at the rotation of the driving wheel e'. If.

however the 4 cam a is adjusted for short throw as shown in Figs. 5 and 6 ,the front' end of the .lever a comes in contact with the roller h at the rotation of the driving wheel whereby, shortlybefore the tappet b drops of! the lever, the rear end of said'v lever 1s swung outward and the tension of sk e' until the tappet b with igs. a.

` against the action of said action whereb length of throw. The

the coal uniformly over the entire length and breadth of the grate.

I claim 1. lil a niechaliiuiil stoken' of the oscillating spreader typo, a spreader mounted to oscillate, means for varying thc reti-active movement. of ,said spreader. for controlling the length of the throw, means for imparting an impelling movement to said spreader, and means for imparting a sudden supplemental retractive movement to 'said spreader immediately. before its dischar movement.

2. In a mechanical Stoker o the oscillating spreader type, a spreader mounted to oscillate, means for imparting a series of retractive movements of rogressively va ing extent to said spreader for varying t e length of the throw, means for 'imparting an impellin movement to said spreader, and means or imparting a sudden supple mental retractive movement to said spreader immediately before its discharge movement, the extent of said supplemental retractive movement decreasing as the length of the throw increases.

3. A mechanical stoker comprising a supporting plate for a fuel charge, a shovel adalpted to oscillate in substantial contact wit said plate -for discharging the fuel therefrom, an oscillatable axle for supporting said shovel, a tappet armon power-storing device for imparting an imelling movement to said shovel, a rotatin rive wheel, a cam element on said drive wheel for cooperating with said tappet arm les to 'swingv said shovel into load position i power-storing device, means for adjustin said cam ele. ment for causin a variab e oscillation of said shovel, an 'I means for imparting a sudden supplemental retractin movement to said shovel prior to the relgease of said tappet arm from said cam'element when said cam element is adu'sted for imparting a relativelysmall oscillatory movement to said shovel.

4. A. mechanical Stoker comprising a supporting plate for a fuel clarge, a shovel aditipted to oscillate in substantial contact wi therefrom, anoscillatable axle for su porting said shovel, a `tappet'arinon sai axle,

said plate lfor discharging the fuel,`

a power-storing device for imparting an impelling movement to said shovel, a rotatlng drive wheel, a cam element pivotally mounted on said drive wheel for cooperating with said tappet arm, vmeans for variably positioning .said cam element around 'its pivotal point, for retracting said sh'ovel to a variab e extent against the action of said power-storing device, vand means for rocking said cam element rior to the release'4 of s'ald tappet arm there om for imparting a sudden supplemental movement to said shovel.

5. A mechanical Stoker comprising'a supporting plate for a fuel charge, a shovel adapted to oscillate in substantial contact withy said plate for discharging the fuel therefrom an oscillatable axle for slporb ing said shovel, a tappet armon sai axle,

a wer-storing device for imparting an im- I0 pe ling movement to said shovel, a rotating drive wheel, a cam element pivote-ily mounted on said drive wheel for cooperatingr Aimparting arockingmovement thereto prior 3 to the re ase ofeald tappet arm therefrom fox-'imparting a sudden supplemental retractive movement* to said shovel. A

The foregoing specification signed at Dolau, Reub, Germany, this 9th day of Aug- 35 ust, 1922.

4 ERWIN ALEXANDER WECK.

1,568,466 l i s a power-storing device for imparting an impelling movement t0 said shovel, a rotating drive wheel, a cam element pivotally therefrom, an oscillatable axle for slpport ing said shovel, a tappet arm on sai axle,

- mpartin a power-storing device for imparting an impelling movement to said shovel, a rotating drive wheel, a cam element pivotally mounted on said drive wheel for cooperating with said tappet arm, means for variably positioning said cam element around its pivotal point for retracting said shovel to a variab e extent against the action of said powerfstoring device, and a fixed abutment or contacting with said cam element and g a rockingmovement thereto prior to the re ease of said tappet arm therefrom -for imparting a sudden supplemental retractive movement to Said shovel.

The foregoing specification signed at Dolan, Reub, Germany, this 9th day of August, 1922. t

i ERWIN ALEXANDER WECK.

Certiiicateof orrection. l

vIlt'ls" lirely" ,certified that in Letters Patent No. 1,566,456

rgranted December 22,

1925,v upon the-application of Erwin Alexander Weck, ofDdlaurBeul), Germany, for

p `an improvement 1n" Mechanical Stoker-s, requiring correction as follows: Page 3,

an error appears in the printed s cication lme 1Q, claim 4, after the wo supplemental insert the word retractiee; and that the said Letters Patent should be read w1t h th1s eorrectlon therein that the same may conform to the record of the case' in thePatent Oilice.

signed' and Sealed this 2d day df'rtbruary, A. 12,1926,

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,566,456, granted December 22, 1925, upon the application of Erwin Alexander Weck, fSDdlamrReub, Germany, for an improvement 1nY- Mechanical Stokers, an error appears in the printed s cication requiring correction as follows: Page 3` line 12, claim 4, after the wo supplemental insert the Word ren-active; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the casein the Patent Oilice.

Signed and sealed this 2d day of February, A. D. 1926.

[5mn] WM. A. KINNAN,

Acting Cmn/rmlraiomr of Patents.y 

